cc65/libsrc/vic20/irq.s

;
; IRQ handling (Vic20 version)
;

        .export         initirq, doneirq
        .import         callirq

        .include        "vic20.inc"

; ------------------------------------------------------------------------

.segment        "ONCE"

initirq:
        lda     IRQVec
        ldx     IRQVec+1
        sta     IRQInd+1
        stx     IRQInd+2
        lda     #<IRQStub
        ldx     #>IRQStub
        jmp     setvec

; ------------------------------------------------------------------------

.code

doneirq:
        lda     IRQInd+1
        ldx     IRQInd+2
setvec: sei
        sta     IRQVec
        stx     IRQVec+1
        cli
        rts

; ------------------------------------------------------------------------

.segment        "LOWCODE"

IRQStub:
        cld                             ; Just to be sure
        jsr     callirq                 ; Call the functions
        jmp     IRQInd                  ; Jump to the saved IRQ vector

; ------------------------------------------------------------------------

.data

IRQInd: jmp     $0000
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00			`;`
			`; IRQ handling (Vic20 version)`
			`;`

Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`.export initirq, doneirq`
			`.import callirq`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`.include "vic20.inc"`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`; ------------------------------------------------------------------------`

Renamed INITBSS to INIT and INIT to ONCE. The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization. 2016-03-06 20:26:22 +00:00			`.segment "ONCE"`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`initirq:`
Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`lda IRQVec`
			`ldx IRQVec+1`
			`sta IRQInd+1`
			`stx IRQInd+2`
			`lda #<IRQStub`
			`ldx #>IRQStub`
			`jmp setvec`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`; ------------------------------------------------------------------------`

			`.code`

			`doneirq:`
Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`lda IRQInd+1`
			`ldx IRQInd+2`
			`setvec: sei`
			`sta IRQVec`
			`stx IRQVec+1`
			`cli`
			`rts`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`; ------------------------------------------------------------------------`

Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`.segment "LOWCODE"`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`IRQStub:`
Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`cld ; Just to be sure`
			`jsr callirq ; Call the functions`
			`jmp IRQInd ; Jump to the saved IRQ vector`
Moved IRQ hooking / unhooking from startup code to constructor / destructor to avoid linking in the hooking / unhooking code (and callirq) for the majority of cc65 prorams not linking in interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5985 b7a2c559-68d2-44c3-8de9-860c34a00d81 2013-02-12 22:39:38 +00:00
			`; ------------------------------------------------------------------------`

			`.data`

Removed (pretty inconsistently used) tab chars from source code base. 2013-05-09 11:56:54 +00:00			`IRQInd: jmp $0000`